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P1847 Transmission Transfer Case Contact Plate 'A' Open Circuit

The OBD2 code P1847 indicates that there is an open circuit in the transmission transfer case contact plate 'A', which means that the electrical connection or signal from this component is not functioning properly

Definition

The OBD2 code P1847 indicates that there is an open circuit in the transmission transfer case contact plate 'A', which means that the electrical connection or signal from this component is not functioning properly

Common causes

  • Faulty contact plate
  • Damaged wiring or connectors
  • Poor electrical connections
  • Short circuit in the wiring
  • Failed transmission control module (TCM)
  • Corroded terminals
  • Faulty transfer case control module (TCCM)
  • Blown fuse related to the transfer case system

Common misdiagnoses

  • Faulty transfer case control module
  • Wiring issues or shorts in the harness
  • Defective transfer case motor
  • Malfunctioning transmission control module
  • Incorrectly diagnosed transmission issues
  • Faulty sensors related to the transfer case
  • Battery or electrical system problems

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are multiple issues

  2. 2. Inspect Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors associated with the transfer case contact plate. Look for signs of damage, corrosion, fraying, or loose connections

  3. 3. Connector Condition

    Ensure that the connectors are securely attached and free of dirt or moisture

  4. 4. Test the Contact Plate

    Resistance Check: Use a multimeter to measure the resistance of the contact plate. Compare the readings to the manufacturer’s specifications

  5. 5. Continuity Test

    Check for continuity in the wiring from the contact plate to the control module. An open circuit may indicate a break in the wire

  6. 6. Inspect the Transfer Case

    Physical Inspection: Look for any signs of physical damage or wear in the transfer case itself that could affect the contact plate

  7. 7. Fluid Levels

    Ensure that the transfer case has the proper fluid levels and that the fluid is in good condition

  8. 8. Check the Control Module

    Software Updates: Verify if there are any software updates available for the vehicle’s control module that may address known issues

  9. 9. Module Functionality

    If possible, test the control module to ensure it is functioning correctly

  10. 10. Perform a Reset

    Clear Codes: After performing inspections and repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  11. 11. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the P1847 code for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes

  12. 12. Seek Professional Help

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with your vehicle’s transmission and transfer case systems.Conclusion By following these troubleshooting steps, you can systematically identify and address the cause of the P1847 code. Always refer to the vehicle’s service manual for specific diagnostic procedures and specifications related to your particular make and model